I need contact number of saudi arabia customer support we need to upgrade our system with einvoicing QR Code

You may have 2 options:

1. Utilize this invoicing app for free with the QR code feature

https://go.zoho.com/wQI

then duplicate the invoice data automatically to your QBO account with this connector.

https://www.integromat.com/?pc=quickbooks

If you accept payments by certain processors (e.g PayPal), you may utilize this app to reconcile transactions easily.

https://synder.grsm.io/quickbooks

2. Contact us in private for another option.